However, when explaining to Susanna and Piers Morgan about one of the comments she received, Noa said the word "motherf***er" just after 7.00am.

Piers struggled to keep the giggles in while his co-host apologised to viewers at home before calling an end to the interview.

Noa, who has 300,000 followers, created an Instagram account called 'deartcatcallers' to show what she endures on a daily basis.

Speaking about the response to her selfies, she said: "I’m also quite shocked by the internet comments. Of course towards both sides I made this project about respect and how you behave with the people on the street and you just treat them in an equal way and then there are these comments that say yeah you should respect everyone and then this motherf***er should die."

A stunned Susanna immediately apologised for the early morning profanity which accidentally slipped out.

She said: "Ok apologies for use of that language on television but it's an example of the sort of thing people have been posting."

The interview, which was then brought to a close, had started off with Noa revealing why she took up her battle against catcallers.

She said: "It was a phenomenon that was really weird for me when I was at a young age, none of my friends knew what to do to it.

"This guy was actually quite aggressive. He came behind me and didn’t even look me in the eye. He honked me on the scooter, cut me off, then was really aggressive."

Noa wanted to send the message that sexist abuse is not ok and that men should approach her in a "respectful way".

Good Morning Britain viewers took to Twitter after hearing Noa swear on air.